CN208078025U - A kind of double-function device based on GeTe - Google Patents
A kind of double-function device based on GeTe Download PDFInfo
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- CN208078025U CN208078025U CN201820727748.5U CN201820727748U CN208078025U CN 208078025 U CN208078025 U CN 208078025U CN 201820727748 U CN201820727748 U CN 201820727748U CN 208078025 U CN208078025 U CN 208078025U
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Abstract
The utility model discloses a kind of double-function device based on GeTe, the device includes three-decker：Top electrode, thin film dielectric layer and hearth electrode.The top electrode is W；The thin film dielectric layer is GeTe films；The material of the hearth electrode is selected from any one of ITO, FTO, ZTO, TaN or TiN.The utility model makes GeTe thin film dielectric layers that different resistance state switchings occur to realize conventional resistive function or complementary type resistive function by controlling the size of operation electric current.In addition, the utility model proposes the conventional resistive function of double-function device can be used as conventional memory memory element, complementary type resistive function can effectively solve the electric current cross-interference issue in resistance-variable storing device right-angled intersection array, by the size for reasonably controlling operation electric current, two kinds of functions are mutually converted, the application range of device is substantially increased.
Description
Technical field
The utility model is related to novel micro nanometer electronic material and function element fields, and in particular to a kind of double based on GeTe
Function element.
Background technology
Resistor type random access memory (RRAM) is because of its simple device architecture, excellent autgmentability, high switching speed
It is considered as one of the candidate of next-generation nonvolatile storage (NVM) with remarkable data holding ability.RRAM and complementation gold
Oxide semiconductor (CMOS) technology of category has good compatibility, thus is easy structure right-angled intersection array (Crossbar
Array) 3D structures come realize high density store.However one of the major defect of this structure is the easy presence of consecutive storage unit
It is the problem of cross-talk, especially more serious when low resistance state is read.The problem is likely to result in memory addressing and reading
Mistake can also increase power consumption and limit the integrated level of right-angled intersection array.Solve the problems, such as a feasible scheme of cross-talk
It is RRAM to connect with selection element such as diode, transistor or gate tube, and expanded correlative study.However it is this
Storage density can undoubtedly be reduced and improve process complexity by increasing the mode of rectifying device.
Complementary type resistance-variable storing device (Complementary Resistive Switching Memory, CRS) can be
Cross-talk is effectively solved the problems, such as in the case of not increasing additional rectifying device.There are two polarity for complementary type resistance-variable storing device tool
Opposite high-impedance state can be arranged to " 1 " or " 0 " state respectively, when applying the storage state for reading voltage reader part,
" 0 " state is still kept and one state can be transformed into low resistance state by SET, since this reading is destructive, so needing
Applying one, reversely write voltage is write as one state device again.The storage of complementary type resistance-variable storing device is not resistance sizes
Variation but the situation of change of device high-impedance state, low resistance state be only present in reading process, thus " 1 " or " 0 " state all show
Go out high-impedance state, so complementary type resistance-variable storing device can inhibit electric current cross-interference issue of the right-angled intersection array in reading.In addition,
Due to no additional rectifying device, complementary type resistance-variable storing device is maintained to 4F2Theoretical minimum unit area, therefore
It is a kind of highdensity crossfire solution of competitive holding resistance-variable storing device.
Utility model content
The purpose of this utility model is to provide a kind of double-function device based on GeTe, the utility model proposes double work(
Energy device can realize that conventional resistive or complementary type resistive are difunctional by limiting the different operation electric current of height.Conventional resistive work(
It can be used as conventional memory memory element, complementary type resistive function can be solved effectively in resistance-variable storing device right-angled intersection array
Electric current cross-interference issue.Operation electric current is reasonably limited, two kinds of functions are mutually converted, and the application range of device will be greatly improved.
To achieve the goals above, the utility model provides a kind of double-function device based on GeTe, using following skill
Art scheme：
A kind of double-function device based on GeTe, the device include three-decker：Top electrode, GeTe thin film dielectric layers and
Hearth electrode.
Further, the top electrode is made of W.
Further, the thickness of the top electrode is 50~500nm.
Further, the top electrode shape is round or rectangle, and diameter or the length of side are 10nm~50 μm.
Further, the GeTe thin film dielectrics layer thickness is 5~200nm.
Further, the GeTe thin film dielectric layers shape is round or rectangle, and diameter or the length of side are the μ of 10nm~50
m。
Further, the hearth electrode is made of FTO, ITO, ZTO, TaN or TiN.
Further, the thickness of the hearth electrode is 50~500nm.
Further, the hearth electrode shape is round or rectangle, and diameter or the length of side are 10nm~50 μm.
Compared with prior art, the beneficial effects of the utility model are：
(1) the utility model proposes a kind of double-function device based on GeTe, can pass through and limit the different operation of height
Electric current realizes that conventional resistive or complementary type resistive are difunctional.Conventional resistive function can be used as conventional store-memory element, complementary
Type resistive function can effectively solve the electric current cross-interference issue in resistance-variable storing device right-angled intersection array.Reasonably limitation operation electricity
Stream, two kinds of functions are mutually converted, and the application range of device will be greatly improved.
(2) the utility model proposes a kind of double-function device based on GeTe be used as conventional resistance-variable storing device when have compared with
Low operation electric current, lower operation voltage, higher stability and preferable tolerance.
(3) the utility model proposes a kind of double-function device based on GeTe be used as complementary type resistance-variable storing device element when
" sandwich " structure with very simple " medium/metal/metal ", and traditional complementary type resistance-variable storing device element is usual
Using the storage unit differential concatenation of two " medium/metal/metal " structures or using with bilayer or multilayer dielectric layer
Structure.It will be apparent that the utility model enormously simplifies the structure of complementary type resistive memory.
(4) the utility model proposes a kind of double-function device based on GeTe be used as complementary type resistance-variable storing device element when
The additional selection element such as transistor, diode or gate tube, which need not be introduced, can effectively solve right-angled intersection array memory part
Electric current cross-interference issue, be conducive to improve device storage density, also simplify device prepare the step of and reduce device system
Standby cost.
(5) the utility model proposes it is a kind of based on the double-function device of GeTe using GeTe materials as medium, material is abundant
It is easy to get, is not necessarily to high-temperature heat treatment, energy conservation and environmental protection in device microization and promotes the reality of right-angled intersection array resistive random access memory to answer
It is had very important significance with aspect.
Description of the drawings
Fig. 1 is the sectional view of double-function device described in the utility model；
Fig. 2 is the conventional change resistance performance current-voltage relation figure of double-function device described in the utility model；
Fig. 3 is the complementary type change resistance performance current-voltage relation figure of double-function device described in the utility model；
Wherein：Fig. 1 is illustrated：1-W electrodes；2-GeTe thin film dielectric layers；3-TiN electrodes.
Specific implementation mode
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Lower obtained every other embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute in the utility model embodiment
It is only used for explaining relative position relation, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, such as
When the fruit particular pose changes, then directionality instruction also correspondingly changes correspondingly.
In addition, the technical solution between each embodiment can be combined with each other, but must be with ordinary skill
Personnel can be implemented as basis, will be understood that this technical side when the combination of technical solution appearance is conflicting or cannot achieve
The combination of case is not present, also not within the protection domain of the requires of the utility model.
A kind of double-function device based on GeTe of the utility model, the device includes three-decker：Top electrode, film
Dielectric layer and hearth electrode.
The top electrode is made of W, and thickness is 50~500nm, and preferably 250nm, shape is round or rectangle, preferably
For rectangle, diameter or the length of side are 10nm~50 μm, preferably 0.4 μm~4.0 μm.
The GeTe thin film dielectrics layer thickness is 5~200nm, preferably 20nm, and the GeTe thin film dielectric layers shape is
Round or rectangle, preferably rectangular, diameter or the length of side are 10nm~50 μm, preferably 0.4 μm~4.0 μm.
The hearth electrode is made of FTO, ITO, ZTO, TaN or TiN, preferably TiN, and thickness is 50~500nm, preferably
200nm, shape are round or rectangle, preferably rectangle, and diameter or the length of side are 10nm~50 μm, preferably 0.4 μm~4.0 μm.
When realizing conventional resistive function, the operation electric current of device limits ranging from 10 μ A~5mA, preferably 1mA.
When realizing complementary type resistive function, the operation electric current of device limits ranging from 5mA~100mA, preferably 10mA.
The utility model by control the size of operation electric current make GeTe thin film dielectric layers occur different resistance state switchings from
And realize conventional resistive function or complementary type resistive function.In addition, the utility model proposes double-function device conventional resistive
Function can be used as conventional memory memory element, and complementary type resistive function can be solved effectively in resistance-variable storing device right-angled intersection array
Electric current cross-interference issue two kinds of functions are mutually converted, device is substantially increased by reasonably controlling the size of operation electric current
Application range.
Embodiment 1
As shown in Figure 1, a kind of double-function device based on GeTe of the present embodiment, the device includes three-decker：Top
Electrode 1, thin film dielectric layer 2 and hearth electrode 3.
The hearth electrode 3 is made of TiN, thickness 200nm, and shape is rectangle, and the length of side is 0.4 μm.
2 thickness of GeTe thin film dielectric layers is 20nm, and shape is rectangle, and the length of side is 0.4 μm.
The top electrode 1 is made of W, thickness 250nm, shape rectangle, and the length of side is 0.4 μm.
When realizing conventional resistive function, the operation electric current of device limits ranging from 1mA.
When realizing complementary type resistive function, the operation electric current of device limits ranging from 10mA.
The present embodiment double-function device described above based on GeTe is prepared with the following method, including following step
Suddenly：
The hearth electrode is prepared in substrate；GeTe thin film dielectric layers are prepared in hearth electrode upper surface；It is situated between in GeTe films
Matter layer upper surface plates top electrode.
The method that the above method specifically uses magnetron sputtering prepares GeTe thin film dielectric layers in the upper surfaces hearth electrode TiN, splashes
Material of shooting at the target is GeTe targets, and using radio-frequency sputtering, underlayer temperature 300K, reaction gas is argon gas, controls the indoor air pressure of vacuum
For 4Torr, radio-frequency sputtering power is 120W.
The method that the above method specifically uses magnetron sputtering prepares W top electrodes, sputtering in GeTe thin film dielectric layers upper surface
Target is W targets, and using d.c. sputtering, underlayer temperature 300K, reaction gas is argon gas, and the control indoor air pressure of vacuum is
4Torr, sputtering power 100W.
The conventional change resistance performance current-voltage relation figure of the present embodiment double-function device obtained above based on GeTe is such as
Shown in Fig. 2, as shown in Figure 2, limitation SET current limlitings are 1mA, and bipolarity electric resistance changing occurs in device, apply forward bias device by
High-impedance state is transformed into low resistance state, applies reversed biased device and returns to high-impedance state by low resistance state, high low resistance state ratio is more than 10.With low
Resistance state is one state, and high-impedance state is " 0 " state, and device can be by applying suitable voltage between " 1 " and " 0 " state
Continuity switching occurs.The complementary type change resistance performance current-voltage relation of the above-mentioned double-function device based on GeTe of the present embodiment
For figure as shown in figure 3, from the figure 3, it may be seen that limitation SET current limlitings are 10mA, there is complementary type electric resistance changing in device.Complementary type resistive characteristic
(the V in suitable voltage rangeth3, Vth1) there are two opposite polarity high-impedance state, HRS for tool+And HRS-Respectively represent two poles
Property opposite high-impedance state positively and negatively.Wherein, high-impedance state HRS is born-In (Vth4, Vth1) it is kept in bias range, when applying
It increases in Vth1 and be less than VthAfter 2 positive bias, high-impedance state HRS is born-Become low resistance state LRS.Positive high-impedance state HRS+In (Vth3,
Vth2) it is kept in bias range, when being applied more than Vth4 and be less than VthAfter 3 back bias voltage, positive high-impedance state HRS+Become low resistance state
LRS.Therefore, it can define in (Vth4, Vth1) the negative high-impedance state HRS stablized-For the one state of device, and in (Vth3, Vth2) in
Stablize positive high-impedance state HRS+For " 0 " state of device." 0 " and one state can be by applying (a Vth1, Vth2) inclined between
It presses to identify.It is also known by Fig. 2, as one (V of applicationth1, Vth2) when bias between, " 0 " represents at this time positive high-impedance state
HRS+Still keep high-impedance state, and the negative high-impedance state HRS that " 1 " represents-Then becoming low resistance state LRS, i.e. the reading of " 1 " has destructiveness,
Need to apply one no more than Vth4 back bias voltage makes it be restored to the negative high-impedance state HRS of " 1 " representative-.The complementary type resistive is deposited
" 0 " of reservoir and one state store all in the form of high-impedance state, can be eliminated in right-angled intersection array without additional selection element
Electric current cross-interference issue.Therefore the above-mentioned double-function device based on GeTe of the present embodiment is conducive to ultra high density, low energy consumption storage
The exploitation of device.
Embodiment 2
A kind of double-function device based on GeTe of the present embodiment, the device includes three-decker：Top electrode, film are situated between
Matter layer and hearth electrode.
The hearth electrode is made of TiN, thickness 200nm, and shape is rectangle, and the length of side is 0.6 μm.
The GeTe thin film dielectrics layer thickness is 20nm, and shape is rectangle, and the length of side is 0.6 μm.
The top electrode is made of W, thickness 250nm, shape rectangle, and the length of side is 0.6 μm.
When realizing conventional resistive function, the operation electric current of device limits ranging from 1mA.
When realizing complementary type resistive function, the operation electric current of device limits ranging from 10mA.
The present embodiment double-function device described above based on GeTe is prepared with the following method, including following step
Suddenly：
The hearth electrode is prepared in substrate；GeTe thin film dielectric layers are prepared in hearth electrode upper surface；It is situated between in GeTe films
Matter layer upper surface plates top electrode.
The method that the above method specifically uses magnetron sputtering prepares GeTe thin film dielectric layers in the upper surfaces hearth electrode TiN, splashes
Material of shooting at the target is GeTe targets, and using radio-frequency sputtering, underlayer temperature 300K, reaction gas is argon gas, controls the indoor air pressure of vacuum
For 4Torr, radio-frequency sputtering power is 120W.
The method that the above method specifically uses magnetron sputtering prepares W top electrodes, sputtering in GeTe thin film dielectric layers upper surface
Target is W targets, and using d.c. sputtering, underlayer temperature 300K, reaction gas is argon gas, and the control indoor air pressure of vacuum is
4Torr, sputtering power 100W.
The conventional change resistance performance current-voltage relation figure of the present embodiment double-function device obtained above based on GeTe with
Fig. 2 is essentially identical, by the conventional change resistance performance current-voltage relation figure of the embodiment it is found that limitation SET current limlitings are 1mA, device
There is bipolarity electric resistance changing, apply forward bias device and low resistance state is transformed by high-impedance state, applies reversed biased device by low
Resistance state returns to high-impedance state, and high low resistance state ratio is more than 10.Using low resistance state as one state, high-impedance state is " 0 " state, and device can
Continuity switching to occur between " 1 " and " 0 " state by applying suitable voltage.The present embodiment is obtained above to be based on
The complementary type change resistance performance current-voltage relation figure and Fig. 3 of the double-function device of GeTe are essentially identical, by the complementation of the embodiment
For type change resistance performance current-voltage relation figure it is found that limitation SET current limlitings are 10mA, there is complementary type electric resistance changing in device.Complementary type
Resistive characteristic (V in suitable voltage rangeth3, Vth1) there are two opposite polarity high-impedance state, HRS for tool+And HRS-Generation respectively
Two opposite polarity high-impedance states positively and negatively of table.Wherein, high-impedance state HRS is born-In (Vth4, Vth1) it is protected in bias range
It holds, when being applied more than Vth1 and be less than VthAfter 2 positive bias, high-impedance state HRS is born-Become low resistance state LRS.Positive high-impedance state HRS+?
(Vth3, Vth2) it is kept in bias range, when being applied more than Vth4 and be less than VthAfter 3 back bias voltage, positive high-impedance state HRS+Become
Low resistance state LRS.Therefore, it can define in (Vth4, Vth1) the negative high-impedance state HRS stablized-For the one state of device, and in (Vth3,
Vth2) stablize positive high-impedance state HRS in+For " 0 " state of device." 0 " and one state can be by applying (a Vth1, Vth2)
Between bias identify.It is also known by the conventional change resistance performance current-voltage relation figure of the present embodiment, when application one
(Vth1, Vth2) when bias between, " 0 " represents at this time positive high-impedance state HRS+Still keep high-impedance state, and the negative high resistant that " 1 " represents
State HRS-Then become low resistance state LRS, i.e. the reading of " 1 " has destructiveness, needs to apply one no more than Vth4 back bias voltage, makes
It is restored to the negative high-impedance state HRS of " 1 " representative-." 0 " of the complementary type resistance-variable storing device and one state are all in the form of high-impedance state
Storage, the electric current cross-interference issue in right-angled intersection array can be eliminated without additional selection element.Therefore the present embodiment is above-mentioned
The double-function device based on GeTe be conducive to the exploitation of ultra high density, low energy consumption memory.
Embodiment 3
A kind of double-function device based on GeTe of the present embodiment, the device includes three-decker：Top electrode, film are situated between
Matter layer and hearth electrode.
The hearth electrode is made of TiN, thickness 200nm, and shape is rectangle, and the length of side is 0.8 μm.
The GeTe thin film dielectrics layer thickness is 20nm, and shape is rectangle, and the length of side is 0.8 μm.
The top electrode is made of W, thickness 250nm, shape rectangle, and the length of side is 0.8 μm.
When realizing conventional resistive function, the operation electric current of device limits ranging from 1mA.
When realizing complementary type resistive function, the operation electric current of device limits ranging from 10mA.
Double-function device based on GeTe described above is prepared with the following method, includes the following steps：
The hearth electrode is prepared in substrate；GeTe thin film dielectric layers are prepared in hearth electrode upper surface；It is situated between in GeTe films
Matter layer upper surface plates top electrode.
The method that the above method specifically uses magnetron sputtering prepares GeTe thin film dielectric layers in the upper surfaces hearth electrode TiN, splashes
Material of shooting at the target is GeTe targets, and using radio-frequency sputtering, underlayer temperature 300K, reaction gas is argon gas, controls the indoor air pressure of vacuum
For 4Torr, radio-frequency sputtering power is 120W.
The method that the above method specifically uses magnetron sputtering prepares W top electrodes, sputtering in GeTe thin film dielectric layers upper surface
Target is W targets, and using d.c. sputtering, underlayer temperature 300K, reaction gas is argon gas, and the control indoor air pressure of vacuum is
4Torr, sputtering power 100W.
The conventional change resistance performance current-voltage relation figure of the present embodiment double-function device obtained above based on GeTe with
Fig. 2 is also essentially identical, by the conventional change resistance performance current-voltage relation figure of the embodiment it is found that limitation SET current limlitings are 1mA, device
There is bipolarity electric resistance changing in part, applies forward bias device and is transformed into low resistance state by high-impedance state, apply reversed biased device by
Low resistance state returns to high-impedance state, and high low resistance state ratio is more than 10.Using low resistance state as one state, high-impedance state is " 0 " state, and device will
Continuity switching can occur between " 1 " and " 0 " state by applying suitable voltage.The present embodiment is obtained above to be based on
The complementary type change resistance performance current-voltage relation figure and Fig. 3 of the double-function device of GeTe are essentially identical, by the complementation of the embodiment
For type change resistance performance current-voltage relation figure it is found that limitation SET current limlitings are 10mA, there is complementary type electric resistance changing in device.Complementary type
Resistive characteristic (V in suitable voltage rangeth3, Vth1) there are two opposite polarity high-impedance state, HRS for tool+And HRS-Generation respectively
Two opposite polarity high-impedance states positively and negatively of table.Wherein, high-impedance state HRS is born-In (Vth4, Vth1) it is protected in bias range
It holds, when being applied more than Vth1 and be less than VthAfter 2 positive bias, high-impedance state HRS is born-Become low resistance state LRS.Positive high-impedance state HRS+?
(Vth3, Vth2) it is kept in bias range, when being applied more than Vth4 and be less than VthAfter 3 back bias voltage, positive high-impedance state HRS+Become
Low resistance state LRS.Therefore, it can define in (Vth4, Vth1) the negative high-impedance state HRS stablized-For the one state of device, and in (Vth3,
Vth2) stablize positive high-impedance state HRS in+For " 0 " state of device." 0 " and one state can be by applying (a Vth1, Vth2)
Between bias identify.It is also known by the conventional change resistance performance current-voltage relation figure of the present embodiment, when application one
(Vth1, Vth2) when bias between, " 0 " represents at this time positive high-impedance state HRS+Still keep high-impedance state, and the negative high resistant that " 1 " represents
State HRS-Then become low resistance state LRS, i.e. the reading of " 1 " has destructiveness, needs to apply one no more than Vth4 back bias voltage, makes
It is restored to the negative high-impedance state HRS of " 1 " representative-." 0 " of the complementary type resistance-variable storing device and one state are all in the form of high-impedance state
Storage, the electric current cross-interference issue in right-angled intersection array can be eliminated without additional selection element.Therefore the base of the present embodiment
Be conducive to the exploitation of ultra high density, low energy consumption memory in the double-function device of GeTe.
Embodiment 4
A kind of double-function device based on GeTe of the present embodiment, the device includes three-decker：Top electrode, film are situated between
Matter layer and hearth electrode.
The hearth electrode is made of TiN, thickness 200nm, and shape is rectangle, and the length of side is 1.0 μm.
The GeTe thin film dielectrics layer thickness is 20nm, and shape is rectangle, and the length of side is 1.0 μm.
The top electrode is made of W, thickness 250nm, shape rectangle, and the length of side is 1.0 μm.
When realizing conventional resistive function, the operation electric current of device limits ranging from 1mA.
When realizing complementary type resistive function, the operation electric current of device limits ranging from 10mA.
Above-mentioned the double-function device based on GeTe is prepared with the following method, includes the following steps：
The hearth electrode is prepared in substrate；GeTe thin film dielectric layers are prepared in hearth electrode upper surface；It is situated between in GeTe films
Matter layer upper surface plates top electrode.
The method that the above method specifically uses magnetron sputtering prepares GeTe thin film dielectric layers in the upper surfaces hearth electrode TiN, splashes
Material of shooting at the target is GeTe targets, and using radio-frequency sputtering, underlayer temperature 300K, reaction gas is argon gas, controls the indoor air pressure of vacuum
For 4Torr, radio-frequency sputtering power is 120W.
The method that the above method specifically uses magnetron sputtering prepares W top electrodes, sputtering in GeTe thin film dielectric layers upper surface
Target is W targets, and using d.c. sputtering, underlayer temperature 300K, reaction gas is argon gas, and the control indoor air pressure of vacuum is
4Torr, sputtering power 100W.
The conventional change resistance performance current-voltage relation figure of the present embodiment double-function device obtained above based on GeTe with
Fig. 2 is also essentially identical, by the conventional change resistance performance current-voltage relation figure of the embodiment it is found that limitation SET current limlitings are 1mA, device
There is bipolarity electric resistance changing in part, applies forward bias device and is transformed into low resistance state by high-impedance state, apply reversed biased device by
Low resistance state returns to high-impedance state, and high low resistance state ratio is more than 10.Using low resistance state as one state, high-impedance state is " 0 " state, and device will
Continuity switching can occur between " 1 " and " 0 " state by applying suitable voltage.The present embodiment is obtained above to be based on
The complementary type change resistance performance current-voltage relation figure and Fig. 3 of the double-function device of GeTe are essentially identical, by the complementation of the embodiment
For type change resistance performance current-voltage relation figure it is found that limitation SET current limlitings are 10mA, there is complementary type electric resistance changing in device.Complementary type
Resistive characteristic (V in suitable voltage rangeth3, Vth1) there are two opposite polarity high-impedance state, HRS for tool+And HRS-Generation respectively
Two opposite polarity high-impedance states positively and negatively of table.Wherein, high-impedance state HRS is born-In (Vth4, Vth1) it is protected in bias range
It holds, when being applied more than Vth1 and be less than VthAfter 2 positive bias, high-impedance state HRS is born-Become low resistance state LRS.Positive high-impedance state HRS+?
(Vth3, Vth2) it is kept in bias range, when being applied more than Vth4 and be less than VthAfter 3 back bias voltage, positive high-impedance state HRS+Become
Low resistance state LRS.Therefore, it can define in (Vth4, Vth1) the negative high-impedance state HRS stablized-For the one state of device, and in (Vth3,
Vth2) stablize positive high-impedance state HRS in+For " 0 " state of device." 0 " and one state can be by applying (a Vth1, Vth2)
Between bias identify.It is also known by the conventional change resistance performance current-voltage relation figure of the present embodiment, when application one
(Vth1, Vth2) when bias between, " 0 " represents at this time positive high-impedance state HRS+Still keep high-impedance state, and the negative high resistant that " 1 " represents
State HRS-Then become low resistance state LRS, i.e. the reading of " 1 " has destructiveness, needs to apply one no more than Vth4 back bias voltage, makes
It is restored to the negative high-impedance state HRS of " 1 " representative-." 0 " of the complementary type resistance-variable storing device and one state are all in the form of high-impedance state
Storage, the electric current cross-interference issue in right-angled intersection array can be eliminated without additional selection element.Therefore the present embodiment is based on
The double-function device of GeTe is conducive to the exploitation of ultra high density, low energy consumption memory.
Embodiment 5
A kind of double-function device based on GeTe of the present embodiment, the device includes three-decker：Top electrode, film are situated between
Matter layer and hearth electrode.
The hearth electrode is made of TiN, thickness 200nm, and shape is rectangle, and the length of side is 4.0 μm.
The GeTe thin film dielectrics layer thickness is 20nm, and shape is rectangle, and the length of side is 4.0 μm.
The top electrode is made of W, thickness 250nm, shape rectangle, and the length of side is 4.0 μm.
When realizing conventional resistive function, the operation electric current of device limits ranging from 1mA.
When realizing complementary type resistive function, the operation electric current of device limits ranging from 10mA.
The above-mentioned double-function device based on GeTe of the present embodiment is prepared with the following method, includes the following steps：
The hearth electrode is prepared in substrate；GeTe thin film dielectric layers are prepared in hearth electrode upper surface；It is situated between in GeTe films
Matter layer upper surface plates top electrode.
The method that the above method specifically uses magnetron sputtering prepares GeTe thin film dielectric layers in the upper surfaces hearth electrode TiN, splashes
Material of shooting at the target is GeTe targets, and using radio-frequency sputtering, underlayer temperature 300K, reaction gas is argon gas, controls the indoor air pressure of vacuum
For 4Torr, radio-frequency sputtering power is 120W.
The method that the above method specifically uses magnetron sputtering prepares W top electrodes, sputtering in GeTe thin film dielectric layers upper surface
Target is W targets, and using d.c. sputtering, underlayer temperature 300K, reaction gas is argon gas, and the control indoor air pressure of vacuum is
4Torr, sputtering power 100W.
The conventional change resistance performance current-voltage relation figure of the present embodiment double-function device obtained above based on GeTe with
Fig. 2 is also essentially identical, by the conventional change resistance performance current-voltage relation figure of the embodiment it is found that limitation SET current limlitings are 1mA, device
There is bipolarity electric resistance changing in part, applies forward bias device and is transformed into low resistance state by high-impedance state, apply reversed biased device by
Low resistance state returns to high-impedance state, and high low resistance state ratio is more than 10.Using low resistance state as one state, high-impedance state is " 0 " state, and device will
Continuity switching can occur between " 1 " and " 0 " state by applying suitable voltage.The present embodiment is obtained above to be based on
The complementary type change resistance performance current-voltage relation figure and Fig. 3 of the double-function device of GeTe are essentially identical, by the complementation of the embodiment
For type change resistance performance current-voltage relation figure it is found that limitation SET current limlitings are 10mA, there is complementary type electric resistance changing in device.Complementary type
Resistive characteristic (V in suitable voltage rangeth3, Vth1) there are two opposite polarity high-impedance state, HRS for tool+And HRS-Generation respectively
Two opposite polarity high-impedance states positively and negatively of table.Wherein, high-impedance state HRS is born-In (Vth4, Vth1) it is protected in bias range
It holds, when being applied more than Vth1 and be less than VthAfter 2 positive bias, high-impedance state HRS is born-Become low resistance state LRS.Positive high-impedance state HRS+?
(Vth3, Vth2) it is kept in bias range, when being applied more than Vth4 and be less than VthAfter 3 back bias voltage, positive high-impedance state HRS+Become
Low resistance state LRS.Therefore, it can define in (Vth4, Vth1) the negative high-impedance state HRS stablized-For the one state of device, and in (Vth3,
Vth2) stablize positive high-impedance state HRS in+For " 0 " state of device." 0 " and one state can be by applying (a Vth1, Vth2)
Between bias identify.It is also known by the conventional change resistance performance current-voltage relation figure of the present embodiment, when application one
(Vth1, Vth2) when bias between, " 0 " represents at this time positive high-impedance state HRS+Still keep high-impedance state, and the negative high resistant that " 1 " represents
State HRS-Then become low resistance state LRS, i.e. the reading of " 1 " has destructiveness, needs to apply one no more than Vth4 back bias voltage, makes
It is restored to the negative high-impedance state HRS of " 1 " representative-." 0 " of the complementary type resistance-variable storing device and one state are all in the form of high-impedance state
Storage, the electric current cross-interference issue in right-angled intersection array can be eliminated without additional selection element.Therefore the present embodiment is above-mentioned
Double-function device based on GeTe is conducive to the exploitation of ultra high density, low energy consumption memory.
Claims (9)
1. a kind of double-function device based on GeTe, it is characterised in that：The device includes three-decker：Top electrode, GeTe are thin
Film medium layer and hearth electrode.
2. the double-function device according to claim 1 based on GeTe, it is characterised in that：The top electrode is made of W.
3. the double-function device according to claim 2 based on GeTe, it is characterised in that：The thickness of the top electrode is 50
~500nm.
4. the double-function device according to claim 3 based on GeTe, it is characterised in that：The top electrode shape is circle
Or rectangle, diameter or the length of side are 10nm~50 μm.
5. the double-function device according to claim 1 based on GeTe, it is characterised in that：The GeTe thin film dielectrics thickness
Degree is 5~200nm.
6. the double-function device according to claim 5 based on GeTe, it is characterised in that：The GeTe thin film dielectric layers shape
Shape is round or rectangle, and diameter or the length of side are 10nm~50 μm.
7. the double-function device according to claim 1 based on GeTe, it is characterised in that：The hearth electrode by FTO, ITO,
ZTO, TaN or TiN are made.
8. the double-function device according to claim 7 based on GeTe, it is characterised in that：The thickness of the hearth electrode is 50
~500nm.
9. the double-function device according to claim 8 based on GeTe, it is characterised in that：The hearth electrode shape is circle
Or rectangle, diameter or the length of side are 10nm~50 μm.
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